![Objective-C: a quick look like C++/Java, but weirder
most of the OO and C++/Java concepts apply, like inheritance, polymorphism.etc.
some syntax difference to make you aware being in Obj-C or C space
you don’t invoke object instances, you send messages to them indirectly
java: calculator.sum(num1Value, num2Value, num3Value);
c++: calculator-> sum(num1Value, num2Value, num3Value);
obj-c: [calculator sum: num1Value withNum2:num2Value withNum3: num3Value]](https://image.slidesharecdn.com/iphonesdksharing1-090901210533-phpapp02/85/iPhone-SDK-dev-sharing-the-very-basics-5-320.jpg)
iPhone SDK dev sharing - the very basics
- 1. iPhone SDK App Development part 1: a very concise introduction
- 2. iPhone SDK the iPhone OS and iPhone SDK dates back to 15+ years ago - both originate from NeXTStep consists of Xcode, Interface Builder, Instruments, iPhone Simulator and more... free download! developer.apple.com/iphone
- 3. iPhone SDK Essential Facts pre-requisites: Intel Mac, Mac OS X 10.5 Leopard, Obj C, OO programming concepts patience, clean mindset test on real devices & iPhone developer programme ($99 per year) AppStore submission:
- 4. The iPhone OS cocoa touch: UIKit framework (iphone specific), Foundation framework (wrappers to Core Foundation String, network, data structures, i18n.etc.) media layer: Quartz (2d vector based drawing api), Core Animation, OpenGL, Audio, Video codecs core services layer: Address Book, Core Foundation, Core Location, Security, SQLite, XML core OS layer: Threading, IO, Memory, File Access, Networking
- 5. Objective-C: a quick look like C++/Java, but weirder most of the OO and C++/Java concepts apply, like inheritance, polymorphism.etc. some syntax difference to make you aware being in Obj-C or C space you don’t invoke object instances, you send messages to them indirectly java: calculator.sum(num1Value, num2Value, num3Value); c++: calculator-> sum(num1Value, num2Value, num3Value); obj-c: [calculator sum: num1Value withNum2:num2Value withNum3: num3Value]
- 6. A typical Objective C class #import <Foundation/Foundation.h> @interface SomeClass:SomeParentClass { BOOL someBooleanValue; @private int someNumber; $protected NSString someString; } + (id) alloc; + (BOOL) anotherClassMethod; - (BOOL) returnSomeBooleanValueMethod; - (NSString) getSomeStringMethod; - (void) setValueOfSomeString: (NSString)someString; @end
- 7. UIKit runtime foundation for iPhone apps apps created in Xcode are linked to UIKit Objective-C framework for event handling, drawing model, windows, views, and controls designed for iPhone
- 8. UIKit elements only covers the basics today UIWindow: space on a screen, like a picture frame UIView: base class of all visual objects. like a canvas. View Controller handles multiple views, orientation changes, transitions.etc.
- 9. The First App app that displays an empty view HelloViewAppDelegate main.m <interface> HelloViewAppDelegate <impl>
- 10. main.m created by Xcode main.m hooks up obj-c framework creates auto-release pool
- 11. HelloViewAppDelegate main.m <interface> HelloViewAppDelegate <impl>
- 12. HelloViewAppDelegate app delegate class: main helper class for handling <impl> important life-cycle events often the bridge between your app and system frameworks, e.g. CoreLocation
- 13. creates a UIView object with size of whole screen add the view to main UIWindow object make window visible mark the objects for release upon exit
- 14. demo
- 15. Adding a bit of text for convenience, create a MainView class extending from UIView, attach an UITextView object to it, then add it back to the main window object HelloViewAppDelegate MainView main.m <interface> HelloViewAppDelegate <impl>
- 17. init a MainView object sets “Hello, World!” to its UITextView object attach it to the app delegate window object
- 18. demo
- 19. Adding orientation change support create a ViewController class to do the heavy lifting ControllerDemoAppDelegate ControlDemoView main.m Controller <interface> ControllerDemoAppDelegate <impl>
- 20. init custom ViewController object
- 21. in this ViewController object, didRotateFromInterfaceOrientation() is overridden to change the text whenever the iPhone is rotated
- 22. demo
- 23. end of part i next: TabViewControllers, Interface Builder, Window Applications, Frameworks, AppStore submission and more